Question

may not/can't/couldn't/needn't/mustn't举例区别意思和用法

Answer 1

may
可能
can
能够
must
必须
need
需要
这四个词应该用中文理解也能区别吧
不过从虚拟语气上来说
may最弱
must最强
may
not
可能不
can't
不能够
mustn't
必须不
needn't
不需要
这里有必要做一下解释may
not也就是个猜测
语气很弱
而can't除了表示不能
还能表示否定猜测
e.g.
the
light
is
off
,she
can't
be
here.
灯灭了,她肯定不在这儿
must表肯定猜测
e.g.the
light
is
still
on
,she
must
be
here.
灯还亮着,她肯定在这儿.
而mustn't
不可乱用
通常只用在一些规章制度上
如果你违反了
比如违规停车就要用mustn't
还有些对话中
must
&
need的交错回答也要领会意思
e.g.
-
must
i
go
now?
-
no,
you
needn't.
其实这里中文就可以辨清
.问我必须去么
回答你不用现在去.
但是也要看具体语境
有时是上级对下级之类的
也会用mustn't回答.
希望对你有帮助.

Answer 2

may
not
语气较弱，”可以不”，You
may
not
finish
your
homework;
can't
”不能”;
You
can't
be
too
serious;问句回答时：Can
I
go
out
to
play?
No,
you
can't.
或做may问句的回答：May
I
sit
here?
No,
you
can't.;
couldn't
语气较委婉，”不能”,常做could疑问句的回答：Could
I
sit
here?
I'm
afraide
you
couldn't;
needn't
表示不必这么做：常做must问句的回答：Must
I
finish
my
homework
today?
No,
you
needn't.
mustn't
语气强，”禁止”:You
mustn't
step
on
the
grass.

Answer 3

may
not
语气较弱，”可以不”，You
may
not
finish
your
homework;
can't
”不能”;
You
can't
be
too
serious;问句回答时：Can
I
go
out
to
play?
No,
you
can't.
或做may问句的回答：May
I
sit
here?
No,
you
can't.;
couldn't
语气较委婉，”不能”,常做could疑问句的回答：Could
I
sit
here?
I'm
afraide
you
couldn't;
needn't
表示不必这么做：常做must问句的回答：Must
I
finish
my
homework
today?
No,
you
needn't.
mustn't
语气强，”禁止”:You
mustn't
step
on
the
grass.